Question

Possible Duplicate:
NSString immutable allows to change its values?

I want to point to an object where in, if I make changes to one object. the same change has to reflect to other object. How to do that?

I have done a sample, but it is not working.

Please check the code once. What is the mistake in my code?

-(void)viewDidLoad{ 
    str = [[NSString alloc] initWithString:@"Taruni"];   
    str2=str;  
    str2=@"Kalpana chawla";  
    [self changeStr:str];  
    NSLog(@"str = %@",str);
    [str release];  
    [str release];   
    [super viewDidLoad];    
}  
-(void)changeStr:(NSString *)x  
{   
    x=@"Chandra";  
}  

In .h file, I have declared in this way

@property(nonatomic,assign) NSString *str;
@property(nonatomic,assign) NSString *str2; 

If I change the value of str2, str is not getting reflected.

How to do that?

Answer 1

Try below code,

-(void)viewDidLoad{
    NSString *str = [[NSString alloc] initWithString:@"Taruni"];
    NSString **str2 = &str;
    *str2=@"Kalpana chawla";
    [self changeStr:&str];
    NSLog(@"str = %@",str);
    [str release];
    [str release];
    [super viewDidLoad];
}
-(void)changeStr:(NSString **)x
{
    *x=@"Chandra";
}